Electrical distribution system



Feb. s, 1938. A H. J, L, FRANK 2,107,412

i ELECTRICAL DISTRIBUTION SYSTEM original Filed Feb. 15, 1932 ACP/( fINVENTOR. f E

ATTORNEY.

Patented F ebUB, 1938 UNITED STATES PATENT orries ELECTRICAL DISTRIBUTINSYSTEM Original application February 15, 1932, Serial No.

592,912, now Patent No. 2,043,796.

Divided and this application January 10, 1936, Serial 2 Claims.

This application relates to electrical distribution systems of the busduct type and is a division of application Serial No. 592,912, ledFebruary 15, 1932, now Patent No. 2,043,796, and relates principally toarrangements for insulating a bus run in a duct run. The applicationdiscloses, in the appended drawinga bus duct run comprising a duct runhaving uniformly spaced openings through which access to the withincontained bus run may be attained and the bus run in the duct run isinsulated by an arrangement of slidable sleeve insulators which may beshifted longitudinally without severance or multilation thereof, toexpose the bus run at one or more desired openings. of the duct run.

In the accompanying drawing,

Fig. 1 is a fragmentary elevation view of a bus duct run;

Fig. 2 is a longitudinal section of the same on line 2-2 of Fig. 3;

Fig. 3 is a transverse section of the same on line 3 3 of Fig. 2.

Referring to the drawing, it will be seen that the bus duct run thereshown includes a duct run in the form of a duct or 'casing 20 having one0f its Walls formed as ahinged cover 2|. Within the duct run is asuitably supported bus run 24. The wall of the run opposite the hingedcover wall is provided at uniformly spaced points with openings 25normally closed by covers 26 removably secured thereon byv screwfastening means or the like; selected ones of the covers may be openedto provide access to the bus run in the duct run at desired points ofthe duct run.

For insulating the bus run, there are provided long sleeves 21 of rigidinsulating material of such diameter as to fit on the run with a fairdegree of friction, whereby they will not shift around the bus runexcept as caused so to do by the user. The sleeves 21 are so disposed onthe bus run as to leave gaps between the ends, and lthese gaps arecovered by short sleeves 28 of rigid insulating material large enough indiameter to encompass the ends of the small sleeves, with a fair degreeof friction.

The bus run is shown ascompletely insulated by sleeves 21and 28, exceptat one opening 25 where a cover 26 has beenremoved.

When for any reason the location of the exposed points of bus run is tobe varied, suitable covers 26 are removed and suitable sleeves 21--28are shifted to expose the bus run where the covers have been removed,and the various sleeves may be shifted to conceal already existent andno longer desired bare spots on the bus run. The baring of a bus run atone spot where it was previously covered, and the covering of a bus runWhere it was previously bare, may be accomplished easily and readily andWithout the aid of tools, special equipment, taping, etc., and merely byshifting the sleeves.

While the sleeves are shown and described as maintained stationary onthe bus bars by their own friction-producing proportions, it will beunderstood that other means, such as wooden pegs 30, may be used tocreate friction between the sleeves 21 and the bus bars. When such pegsare used, they may be sheared off by the sleeves 22 as the latter areshifted about on the sleeves 21. These pegs also serve to space theshort sleeves on the longer ones, uniformly if desired.

While two sizes of sleeves are shown, it is obvious that one size aloneor more than two sizes may be employed, the only desirability being thatno sleeves be longer than the distance between the uniformly spacedopenings normally covered by the covers.

I claim:

1. In an electrical vdistribution system, a long run of bus bar, andmeans for insulating the run including-a plurality of short insulatingsleeves on, and covering substantially the entire length of said busrun, the sleeves being larger in cross section than the bus bars so asto be slidable along the run, without destruction or alteration ofthemselves or the bus bar, to expose the bus bar at desired points onthe run, and to insulate the bus bar at other points.

2. In a electrical distribution system, a long run of bus bar, and meansfor insulating the run including a plurality of short insulating sleeveson, and covering substantially the entire length of said bus run, thesleeves being larger in cross sectionvthan the bus bars so as to beslidable along the run, without destruction or alteration of themselvesor the bus bar, to expose the bus bar at desired points on the run, andto insulate the bus bar at other points, one series of the sleeves beingslidable over the sleeves of the other series and normally overlappingtheir ends to insulate certain parts of the bus bar left exposed by thelast named series of sleeves.

HARRISON J. L. FRANK.

